libcamera: camera_manager: Turn enumerator into a unique_ptr<>

Convey the fact that the CameraManager class owns the DeviceEnumerator
instance it creates by using std::unique_ptr<> to store the pointer.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

include/libcamera/camera_manager.h

@@ -7,6 +7,7 @@
 #ifndef __LIBCAMERA_CAMERA_MANAGER_H__
 #define __LIBCAMERA_CAMERA_MANAGER_H__
 
+#include <memory>
 #include <string>
 #include <vector>
 
@@ -37,7 +38,7 @@ private:
 	void operator=(const CameraManager &) = delete;
 	~CameraManager();
 
-	DeviceEnumerator *enumerator_;
+	std::unique_ptr<DeviceEnumerator> enumerator_;
 	std::vector<PipelineHandler *> pipes_;
 
 	EventDispatcher *dispatcher_;